#include <iostream>
#include <algorithm>
using namespace std;
 
int main(){
	int N, K;
	cin >> N >> K;
	int max_num = 0;
	int min_num = 1000;
	for(int i = 0; i < N; i++){
		int n;
		cin >> n;
		max_num = max(max_num, n);
		min_num = min(min_num, n);
	}
	cout << max_num - min_num << endl;
}